Libraries should indeed be used in real life programming of python.

The purpose of coding challenges is however, to learn to think how to use algorithms to solve problems. Not to get a working code for a client.

This guy, using a library to do the entire problem, removed the entire challenge of this kata. He solved a 8 kyu problem at best. It's like getting a math problem and then googling the solution. You learn nothing and getting the answer don't show knowledge or skill. Everyone can google. Importing a library that does litterally the whole challenge... not the purpose of the challenge. Unless you think googling the most easy to understand libraries is super hard, and your goal is to practice them. In that case I suggest going to one of those 75 + year meetings where they teach basic computer knowledge

These goals are not mutually exclusive. Exactly the opposite in most practical cases.

I thought about it later again...

It definitely depends on your goal for training.
If you want to learn libraries, go for libraries.
If you want to learn to program algorithms, then go for that.

I never understood why people get mad at others for using libraries. Its like saying you cant use calculators to do math. I dont understand the gate keeping. idiots praise complexity